1-A heat exchanger has been designed, and insulation for the unit is being examined. The insulation is available in three thicknesses: 0.025, 0.051, and 0.076 m. The following information was gathered for various insulation thicknesses and is presented in the table below. Heat has a value of $0.33/MJ. The equipment's salvage value is projected to be $10 x 10³ at the end of its expected 5-year operational life.

1-) When comparing Rate of Return on Investment (ROROI) percentages, what thickness of insulation should be used?

2-) According to the Net Present Values (NPV) of all insulations with a 25% interest rate, what thickness of insulation should be used?

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0.025 m 0.051 m 0.076 m kJ/s energy saved 21 24.5 26 Cost for installed insulation, $ 150 x 103 190 x 103 250 X 103 Annual fixed charges, % of installed cost 10 10 10 0.025 m 0.051 m 0.076 m kJ/s energy saved 21 24.5 26 Cost for installed insulation, $ 150 x 103 190 x 103 250 X 103 Annual fixed charges, % of installed cost 10 10 10